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E-liquid is the mixture used in vapor products such as e-cigarettes [28] and usually contain propylene glycol, glycerin, nicotine, flavorings, additives, and differing amounts of contaminants. [29] E-liquid formulations greatly vary due to fast growth and changes in manufacturing designs of e-cigarettes. [15]
This easy DIY tutorial helps you make a non-Newtonian liquid at home with a few simple ingredients.
The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1]
Metal parts of e-cigarettes in contact with the e-liquid can contaminate it with metals. [15] Heavy metals and metal nanoparticles have been found in tiny amounts in the e-cigarette aerosol. [notes 6] [15] Once aerosolized, the ingredients in the e-liquid go through chemical reactions that form new compounds not previously found in the liquid. [17]
LCD in a Texas Instruments calculator with top polarizer removed from device and placed on top, such that the top and bottom polarizers are perpendicular. As a result, the colors are inverted. The optical effect of a TN device in the voltage-on state is far less dependent on variations in the device thickness than that in the voltage-off state.
Made in Japan, this was also the first calculator to use an LED display, the first hand-held calculator to use a single integrated circuit (then proclaimed as a "calculator on a chip"), the Mostek MK6010, and the first electronic calculator to run off replaceable batteries. Using four AA-size cells the LE-120A measures 4.9 by 2.8 by 0.9 inches ...
Marchant XLA calculator, based on Friden's design. The Marchant Calculating Machine Company was founded in 1911 by Rodney and Alfred Marchant in Oakland, California. The company built mechanical, and then electromechanical calculators which had a reputation for reliability.
The TI-59 is an early programmable calculator, that was manufactured by Texas Instruments from 1977. It is the successor to the TI SR-52, quadrupling the number of "program steps" of storage, and adding "ROM Program Modules" (an insertable ROM chip, capable of holding 5000 program steps).